Antlia NEW Solar Discover 3nm CaK filter (SD-CAK3)

Antlia New Solar Discover 3nm CaK filter

• Telescope-side connection is 1.25" and 2"
• Camera side connection is 2" with ring clamp
• Transmission at 393.3 nm - FWHM is 3 nm
• Maximizes the contrast of sunspots, granulation and faculae on the solar surface
•  Ideally suited for combination with a Herschel prism
•  The filter is not intended for visual observation

The Antlia Solar Discover 3nm CaK is an assembly consisting of one set of light reducing filters, designed to maximize imaging contrast of sun spots, solar surface granulation and other features that are prominent in CaK 393.3nm line.  

An Antlia 3nm Ultra narrow bandpass filter wavelength centered on Calcium II K-Line 393.3nm is built in. Its high blocking specification of OD5 (0.001%) intends to reduce most solar heat ingress.

Compared to solar Herschel Wedge, the Antlia Solar Discover CaK 3nm assembly features a new tube structure design, 1.25’’ and 2’’ adapters are designed, as well as the addition of light-reducing filters. Installation is similar to the Antlia CaK 3nm Solar Herschel Wedge, with the telescope attached at one end and the camera at the another. The metal tube machined from aircraft aluminum CNN and oxidized. The filters are assembled in a fully closed tube. No stray light can escape from this.

Important Notes

- When you are using a zenith mirror, the ERF filter must be installed in the correct position for safe operation. Please refer to the installation diagram.

- When you are using a telescope with an aperture ＞100mm, you need to use additional light reduction solutions, such as ERF filters，solar safety films, lowering the telescope aperture for safe operation while using Solar Discover 3nm CaK; If without the extra light reduction solution, the Solar Discover 3nm CaK can only used with REFRACTORS up to 100mm aperture.

About Visual Observation

The bandpass of CaK (393.3 nm) is almost invisible to the human eyes, hence, the Antlia Solar Discover 3nm CaK assembly is primarily used for solar imaging and not recommended for visual observation due to the difficulty of many to visually see information that CaK has to offer.

In addition, the IR coating range of our products is slightly different from the ISO 12312-2 Standard for Solar Viewers, please see the following chart and refer to ISO 12312-2 Standard for Solar Viewers (https://eclipse.aas.org/eye-safety/iso12312-2).

For tough technical requirements and safety considerations, we do not recommend Solar Discover 3nm CaK assembly for visual observation.If you need to use the product for visual observation, it is important to ensure that all filters built into the assembly are in good condition for safety. Please contact Antlia if you have any questions.

Technical Specifications

In the Box

•  CaK filter system
•  Protective caps on both sides
•  Case

Warranty & Manual 

Warranty: 3-years

Disassembly of the assembly is prohibited and voids warranty. Any repair/returns/exchange

for this item is not accepted once it has been disassembled.